【www.gdgbn.com--mysql教程】
代码如下class dbmysq {
var $querynum = 0;
var $link;
var $histories;
var $time;
var $tablepre;
function connect($dbhost, $dbuser, $dbpw, $dbname = "", $dbcharset, $pconnect = 0, $tablepre="", $time = 0) {
$this->time = $time;
$this->tablepre = $tablepre;
if ($pconnect) {
if (!$this->link = mysql_pconnect($dbhost, $dbuser, $dbpw)) {
$this->halt("can not connect to mysql server");
}
} else {
if (!$this->link = mysql_connect($dbhost, $dbuser, $dbpw, 1)) {
$this->halt("can not connect to mysql server");
}
}
if ($this->version() > "4.1") {
if ($dbcharset) {
mysql_query("set character_set_connection=" . $dbcharset . ", character_set_results=" . $dbcharset . ", character_set_client=binary", $this->link);
}
if ($this->version() > "5.0.1") {
mysql_query("set sql_mode=""", $this->link);
}
}
if ($dbname) {
mysql_select_db($dbname, $this->link);
}
}
function fetch_array($query, $result_type = mysql_assoc) {
return mysql_fetch_array($query, $result_type);
}
function result_first($sql, &$data) {
$query = $this->query($sql);
$data = $this->result($query, 0);
}
function fetch_first($sql, &$arr) {
$query = $this->query($sql);
$arr = $this->fetch_array($query);
}
function fetch_all($sql, &$arr) {
$query = $this->query($sql);
while ($data = $this->fetch_array($query)) {
$arr[] = $data;
}
}
function cache_gc() {
$this->query("delete from {$this->tablepre}sqlcaches where expiry<$this->time");
}
function query($sql, $type = "", $cachetime = false) {
$func = $type == "unbuffered" && @function_exists("mysql_unbuffered_query") ? "mysql_unbuffered_query" : "mysql_query";
if (!($query = $func($sql, $this->link)) && $type != "silent") {
$this->halt("mysql query error", $sql);
}
$this->querynum++;
$this->histories[] = $sql;
return $query;
}
function affected_rows() {
return mysql_affected_rows($this->link);
}
function error() {
return (($this->link) ? mysql_error($this->link) : mysql_error());
}
function errno() {
return intval(($this->link) ? mysql_errno($this->link) : mysql_errno());
}
function result($query, $row) {
$query = @mysql_result($query, $row);
return $query;
}
function num_rows($query) {
$query = mysql_num_rows($query);
return $query;
}
function num_fields($query) {
return mysql_num_fields($query);
}
function free_result($query) {
return mysql_free_result($query);
}
function insert_id() {
return ($id = mysql_insert_id($this->link)) >= 0 ? $id : $this->result($this->query("select last_insert_id()"), 0);
}
function fetch_row($query) {
$query = mysql_fetch_row($query);
return $query;
}
function fetch_fields($query) {
return mysql_fetch_field($query);
}
function version() {
return mysql_get_server_info($this->link);
}
function close() {
return mysql_close($this->link);
}
function halt($message="", $sql="") {
exit("
提示:数据库错误
sql语句:" . $sql . "
错误关键字:" . mysql_error());
}
}
?>